Glass ceramic dielectric with high breakdown strength and preparation method thereof
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A glass-ceramic and dielectric technology, applied in the field of glass-ceramic dielectrics, can solve the problems of difficult to completely eliminate pores and low voltage resistance, and achieve the effects of good dielectric constant temperature stability, good stability, and high dielectric constant.
Inactive Publication Date: 2013-05-15
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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However, since this type of ceramic medium is prepared by the traditional powder sintering process, it is difficult to completely eliminate the pores during the sintering process, and eventually remain in the sintered body to form pores
Porosity is one of the most important factors affecting the breakdown field strength of ceramics. Therefore, ceramics prepared by high-temperature solid-state sintering technology usually have low pressure resistance, and the breakdown field strength is generally around 10kV / mm
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[0018] The following examples can enable those skilled in the art to understand the present invention more comprehensively, but do not limit the present invention in any way.
[0019] This experimental example is an experimental example for providing a basis for limiting the range of components of the glass ceramics of the present invention.
[0020] First choose analytically pure PbO, BaCO 3 , SrCO 3 , Nb 2 o 5 , Na 2 CO 3 , SiO 2 , R is the raw material, according to the molar ratio in Table 1, respectively batching, using deionized water as the dispersion medium, zirconia balls as the grinding medium, mixing in a nylon tank for 4 hours by using a turning mixer, and mixing the uniform slurry Dry in an oven at 120°C.
[0024] Then the homogeneously mixed raw materials were added into a platinum crucible, and kept at a high temperat...
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Abstract
The invention discloses a glass ceramic dielectric with high breakdown strength suitable for usage in high voltage direct current environment and a preparation method thereof, and belongs to the technical field of glass ceramic dielectric. The glass ceramic dielectric comprises a composition of xPbO-yBaO-zSrO-aNb2O5-bNa2O-cSiO2-dR, and x, y, z, a, b, c and d satisfy the relations of: 0<=x<=17.1, 0<=y<=17.5, 0<=z<=14.3, 10.7<=a<=34, 11<=b<=25.4, 28<=c<=47, and 0<=d<=4.5; R represents an auxiliary component, which is at least one selected from MnO2, MgO, CaO and ZnO; and x, y, z, a, b, c and d represent molar ratios. The glass ceramic dielectric provided by the invention has advantages of high breakdown strength, high dielectric constant and good dielectric constant temperature stability, and realizes no pore and direct current breakdown strength higher than 50kV / mm.
Description
technical field [0001] The invention belongs to the technical field of glass-ceramic dielectrics suitable for use in high-voltage DC environments, and in particular relates to a glass-ceramic dielectric with high breakdown field strength and a preparation method thereof, which is suitable as a high-voltage capacitor medium. Background technique [0002] High-voltage capacitors are one of the indispensable electronic components in high-voltage, high-power pulse equipment. With the development of miniaturization and light weight of high-voltage equipment, requirements for high-voltage capacitors such as high withstand voltage, high energy storage, and high stability have been put forward. [0003] At present, high-voltage ceramic capacitors, the ceramic core is mainly BaTiO 3 , SrTiO 3 It is a sintered ceramic. This type of ceramic medium usually has a high dielectric constant, and the dielectric constant can be adjusted in the formula or improved in the process within a cer...
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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/02C03B32/02
Inventor 杜军张庆猛罗君唐群韩东方周毅
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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